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Old 07-17-2009, 10:48 PM   #1 (permalink)
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Question Matching Tire Size - Mismatched Brand - Air Pressure

sorry for the edit, info changed around


ok, so i got 4 new tires (90%+ tread) on steelies

3 are sumitomo (51 psi)
1 is "i forgot" (44 psi)

all 4 are 175/70R13


what do i do about tire pressure?


44 to be safe
50 to chance
or throw caution to the wind and go for 60

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Old 07-19-2009, 09:51 AM   #2 (permalink)
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I wouldn't inflate passed the maximum a tire is designed for. You would get better mileage gains for moon discs, etc.
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Old 07-19-2009, 12:50 PM   #3 (permalink)
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You'll have to find the load rating for each tire at a given pressure, and inflate them all to a pressure where the load ratings correspond for best handling characteristics. Some tires do not have max load at max pressure, and some do.

They don't need to be even pressures, either. If your Sumi's have max load at 51 PSI, then your other one has max load at 41 PSI, do that.
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Old 07-19-2009, 03:30 PM   #4 (permalink)
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thanks for the replies


one of the mpg rules are to max or (overinflate) your tires

so i was curious what everyone would say
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Old 07-19-2009, 07:36 PM   #5 (permalink)
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Quote:
Originally Posted by Christ View Post
You'll have to find the load rating for each tire at a given pressure, and inflate them all to a pressure where the load ratings correspond for best handling characteristics. Some tires do not have max load at max pressure, and some do.
Quote:
Originally Posted by Christ View Post
I've run overinflated tires for years... I mean seriously over inflated... and probably over loaded, as well. Still haven't had problems with uneven wear


So which ones better?
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Old 07-19-2009, 07:50 PM   #6 (permalink)
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I personally run overinflated, but I don't usually recommend it to others. Sure, there might be safety concerns, and that's why I don't offer it as advice normally.

For me, overinflated helps with laziness as well as mileage. I hate checking my tire pressure. YMMV.
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Old 07-19-2009, 08:11 PM   #7 (permalink)
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I usually go over too

but i wonder if im making too much of a deal out of this

im just not used to running different tire brands
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Old 07-19-2009, 08:18 PM   #8 (permalink)
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Just do what I said earlier until you can get a replacement tire that matches the Sumi's, so you can use the "I forgot" (never heard of that one... ) for a full size spare.
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Old 07-19-2009, 08:30 PM   #9 (permalink)
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Just do what I said earlier until you can get a replacement tire that matches the Sumi's, so you can use the "I forgot" (never heard of that one... ) for a full size spare.

i think its a bridgestone (still not sure)


im not going to be getting another tire so these are IT

so i guess ill go recommended max on all 4



i got the set for $60 btw

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